App Store > macOS High Sierra > Download

We could not complete your purchase.

You do not have enough space to install macOS High Sierra.

[ Learn More ] [ OK ]

That [ Learn More ] button does nothing at all. I opened the Console app and filtered the messages using "App Store" and I found this:

Rejected request to open untrusted URL DABuyButtonLearnMoreURL.Yosemite

I'm running macOS Sierra 10.12.6

1 Answer 1


I had the same issue and I thought I had enough space but I didn't. You need at least 14.3GB I believe. It downloaded for me afterwards

  • I didn't have enough space to install the upgrade, but I had some free space, so this should not have prevented the Learn More button from working.
    – pyb
    Oct 31, 2017 at 14:03

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